Home / 1,809-3,915

Finding the Third Proportional to 1,809 and 3,915

Calculator

Solution

The third proportional to 1,809 and 3,915 is: 8,472.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,809 : 3,915 = 3,915 : x
  2. Step 2: Convert to fraction form
    1,809/3,915 = 3,915/x
  3. Step 3: Cross multiply
    1,809x = 3,915 × 3,915
  4. Step 4: Simplify right side
    1,809x = 15,327,225
  5. Step 5: Solve for x
    x = 15,327,225/1,809
  6. Step 6: Final answer
    x = 8,472.76

Related Problems

Find third proportional to 904.50 and 1,957.50
Half scale
Find third proportional to 3,618 and 7,830
Double scale
Find third proportional to 1,811 and 3,919
Similar ratio
Find third proportional to 2,713.50 and 5,872.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.